Method of molding name plates



Oct. 13, 1942. J. A. GlTs ETAL METHOD 0F MoLDING NAME PLATES original Filed Mrch 12,'1958 f'W2pmempxpxmxmww 2 Sheets-Sheet l Oct. 13, 1942. J. A. GlTs ETAL 2,298,365

METHOD OF MOLDING NAME PLATES Original Filed Mroh l2, 1938 2 Sheets-Sheet 2 Eile ilim

Patented Oct. 13, 1942 METHOD OF MOLDING NAME PLATES Joseph A. Gits and Jules P. Gts, Chicago, Ill., as-

signors to Gits Molding Corporation, Chicago,

Ill., a corporation of Illinois Original application March 12, 1938, Serial No. 195,504. Divided and this application November 18, 1939, Serial No. 305,051

13 Claims.

This invention relates to name platesV or like articles, and is directed more particularly to an improved construction wherein characters, insignia or other surfaces are formed upon the plate in a distinctive and novel manner.

The invention has been illustrated herein as being embodied in name plates and therefore as being particularly adapted thereto, but it will be understood that the invention is not necessarily limited in its application and usefulness to name plates, but may be used elsewhere.

The present case is directed to the method of making the product disclosed herein and is a division of our parent application, Serial No. 195,504, filed by us March 12, 1938, wherein the product is disclosed and claimed.

Name plates are commonly molded of plastic materials and are widely used at the present time. Before the molding operation, pigments are frequently added to the plastic materials to obtain the color desired. The name, characters or other in a single operation, the characters or -insignia being formed by being recessed in or by beingmolded upon the surface in relief. Any attempt to secure a proper contrasty eiect between the characters and the name platel by painting either the characters or the name plate has met with difficulty and has failed to produce satisfactory results. not satisfactorily retain paint upon their surfaces. The paint may adhere temporarily but any subsequent handling will not only soil the same but cause it to be quickly worn free. Moreover, painting operations involve labor and are costly. If the name plates are dipped and then wiped, there is a considerable loss. Wiping will invariably remove portions of the paint from the surfaces to bepainted and often an undesirable smeary appearance will result. It is astep that is diiiicult for a workman to perform. If raised or inlaid surfaces are on the plates for decorative purposes, and are not to receive the same color as the characters or the plates or other insignia, painting by dipping cannot be resorted to. Hand painting with a brush is likewise laboriousand involves many diiculties from a production standpoint. The same is true whether the name or insignia is inlaid or carried upon the plate in relief.

An essential object of this invention is to provide a construction and a method for producing the same, that will overcome the diiiiculties above noted and permit the manufacture of molded name plates, as well as other articles, in a simple Cellulose compositions particularly will and inexpensive manner and have a name or other insignia molded upon the plate as an integral part thereof but ofa different color, if desired, than that of the plate. Moreover, different portions of the name plate that are provided for decorative purposes and not a part of the name, characters or insignia upon the plate. may be likewise formed of different colors so as to carry out the decorative scheme along extensive lines.

A further object of this invention resides in the simple operation of securing the aforesaid results by a second molding operation but in a manner eiectingka bond between the portions of the first and second operations that will be permanent, and, for all essential purposes, will give the appearance of being made in one operation, the portions also appearing to be of the same material except for their difference in color.

Specifically, the invention is to be noted for the type of bond secured that makes separation of the different portions practically'impossible. The portions formed by the second operation are so intimately united with the name plate, by the bonding action produced, that it is physically impossible to effect a separation without destruction.

Although a bonding action securing a mechanical interlock between the characters or other insignia and the name plate is also disclosed, it will be understood that the manner in which the molding operation is performed may, in itself, secure a bond that will effectively unite the parts into one unit and prevent their easy separation.

The type of mechanical interlock between the characters or other insignia and the name plates, which We have disclosed herein, is however, a

feature of the invention that is considered of importance and has advantage and benets which are oi" much value in this kind of work.

Other objects and advantages of the invention will be noted from the following detail description of the invention when taken in connection with the accompanying drawings which form a part hereof.

In the drawings:

Figure 1 is an elevation of a name plate looking at its front face before any characters or symbols are formed thereon;

Fig. 2y is a horizontal sectional View taken on line 2-2 of Fig. 1;

Fig. 3 is a vertical sectional view taken through a mold in which this name plate has been placed for a second molding operation;

Fig. 4 illustrates the name plate in finished form after the second molding operation;

Fig. 5 is an end view of the same;

Fig. 6 is an elevation of the rear face of this finished name plate;

Fig. '1 is a vertical sectional view taken on line 1-1 of Fig. 4;

Fig. 8 is a horizontal sectional view taken on line 3-8 of Fig. 4;

Fig. 9 is a slightly modified form of name plate before characters or symbols are formed thereon, having recesses therein conforming to the characters to be formed;

Fig. 10 is a vertical sectional view taken on' line III-I0 of Fig. 9;

Fig. 11 is a horizontal sectional view taken on line II-II of Fig. 9;

Fig. 12 is a view similar to Fig. 1l but after the second operation forming the letters or symbols;

Fig. 13 illustrates a further variant embodiment of the invention;

Fig. 14 is an end view of the same;

15 is a view of the rear face of the same;

Fig. 16 is a horizontal sectional view taken on line IS-IS of Fig. 13;

Fig. 17 is a vertical sectional view taken on line II-II of Fig.-13;

Fig. 18 illustrates the type of name plate that is shown in Fig. 13 positioned in a mold and ready for a second operation to form the characters and other surfaces thereon;

Fig. 19 is a horizontal sectional view of a name plate of the type shown in Fig. 13 but illustrating the characters in slight relief instead of being iiush;

Fig. 20 is an end view of the name plate shown in Fig. 19;

Fig. 21 is a view of a further embodiment of the invention as applied to surfaces adapted to have transparent markings or calibrations thereon;

Fig. 22 is a rear view of the same;

Fig. 23 is a vertical sectional view of the taken through the larger markings; and

Fig. 24 is a vertical sectional view taken through the smaller calibrations.

Name plates and articles capable of embodying the present invention are usually adapted to have their characters, symbols or surfaces formed or carried upon their front face in various ways;

Same

According to the invention, these letters, symbols or surfaces may be either inlaid and formed in relief or flush with the surface, or not inlaid and formed uponthe surface in relief only. Accordingly, it may be mentioned at the outset with respect to a broad aspect of the invention that it is immaterial how' these characters, symbols or faces are formed or carried and that the features of the yinvention may be incorporated in various types of structures whether they comprise name plates or other articles wherein it is desirable to form component parts thereof out of differently colored material by separate molding operations to make them in'eifect appear as an integral part of the plate or article, although being material of different color and formed by a separate molding operation. Y

Fig. 1 illustrates a name plate I before the molding operation forming the characters. Fig. 4 illustrates name plate I in its finished form after the characters are formed. In this illustration, however, letters designated 2 are formed in relief upon front face 3, the latter being substantially smooth and against which the letters 3 are held. A recess 4 is formed in rear lface 5. A plurality of passages or small openings 6 place recess 4 in communication with front face 3. As will be described presently, formation of recess 4 and the provision of passages i will depend upon the manner in which letters 2- are to be formed upon front face I. If letters 2 are to form a word written in script, passages 6 are provided in any desired number, irrespective of whether the plate I is recessed to receive a portion of the material forming letters 2 as will be hereinafter described, or whether these letters 2 are carried against front face I, as shown in i Fig. 4.

After plate I, as shown in its form in Fig. l, is formed, it is placed in a second mold 3 so that its rear face 5 is positioned against the face of the molds matrix 9 and openings 6 communicates with a cavity II cut in patrix I0. Cavity II corresponds to the letters or characters of the word or symbol to be molded upon front face I. One or more passages I4 in matrix 9 communicate with recess 4 and the source of supply of the plastic composition. It is this plastic composition that is of a different color than plate I and it preferably enters recess 4, opening 6 and cavity I I byA an injection operation under a relatively high pressure. For example, we have found pressures in the order of thirteen to fifteen tons per square inch may be advantageously used to insure that the molten material will be forced into all, portions of cavity II and that a bond will be, by reason of this high pressure, formed between the letters 2 and plate I that will firmly hold the letters against the plate and prevent their separation independently of any mechanical interlocking key means herein disclosed.

The arrangement of recess 4 in rear face 5 advantageously furnishes, however, key means I2 in the shape of an integrally formed strip that may lie substantially the length of the word or symbol formed by letters 2. This strip I2 is integrally interlocked with letters 2 by the connections I3 formed by this material of the second operation filling passages 6.

Although recess 4 may be of any cross-sectional shape or configuration, we find that the mechanical interlocking action or keying may be materially strengthened or made more efficient by providing passages 6 of different cross-section than recess 4. Consequently, extensions I3 will be of different shape cross-sectionally than strip I2, which prevents any tendency for letters 2 to .be stripped from front face 3. In other words, not only will injection-molding under high pressure in itself provide a bond of adequate strength to unite letters 2 to the front face 3 of plate I but the mechanical interlocking action furnished by extensions I3 and strip I2 will mechanically interlock letters 2 with .plate I so as to make them an integral-like part of the plate. A product or article is thereby produced that comprises in effect a base or background of one material or color and characters or symbols carried thereby of the same or different material or of a different color, so as to produce the appearance of a structure whose characters or symbols are an integral part thereof but have a definitely different appearance or color than the base.` An exceptionally firm bond or mechanical interlock is provided to assure that the characters will not be separated from the base. The advantages of the construction are numerous. Characters or symbols may be formed upon a name plate that will be of a different color than that of the base and will thereby present a desirable contrasty appearformed in front face 4|.

ance without any possibility of the color changing or being removed which was heretofore experienced when the characters or symbols were painted. A very neatly finished product is obtained that has a proper finished appearance and which may be produced at a greatly reduced cost and eliminate the labor difliculties of painting operations. f As stated above, the letters or characters forming the symbol or other indicia to be formed upon the name plate may have a portion thereof embedded in a recess in the front face of the plate. Such a construction is illustrated in Figs. 9 to 12, inclusive. in its first molding operation with a recess or plurality of recesses 2I in its front face 3 corresponding to the shape or configuration of the letters or characters to be formed. If desired, these letters or characters may be individually formed,

as shown at 20 in Fig. 12, and not connect with each other, as shown in Fig. 4. Plate I will, therefore, be formed with a plurality of recesses 2|, each corresponding to some portion of the symbol, such as each letter of the name to be formed. Rear face will be provided with a recess 22 extending somewhat lengthwise of the area covered by the word to be formed on front face I. Recess 22 may be so formed in plate I as to extend at least to the oor 23 of recesses 2| and thereby be in communication therewith. It will be observed that each recess 2| (will have one or more openings 24 with recess 22. Floor 23 of these recesses will be cut away where these recesses intersect with recess 22. Adequate communication between recess 22 and recesses 2| will be provided to assure a proper flow of material into recesses 2| to form letters 20. If these letters are to be formed in relief with respect to front face 3 of plate I, the patrix [I0 of mold 8` may likewise have corresponding cavities II that will form the individual letters 20. Again, plate I is placed in mold 8 for a second injection operation to secure a ow of the differently colored material forming words 2|) through recess 22 and then into the recesses 2|.

A device embodying the present invention may not only have letters or characters forming symbol or like indicia of a differently colored material thereon but may have a surface ornamentation likewise constructed. Such a structure is shown in Figs; 13 to 18, inclusive. It may comprise, for example, letters 30 forming a trade name or like indicia that is of a differently colored material than plate 3|, and also comprise a number of surfaces 32 and 33 formed of a Astill 35 in rear face 36 extending inwardly in the body of plate 3| to intersect the floor of recesses 31. Also, additional recesses 33 similar to that of recess 35 may be provided in plate 3| at the rear face 36 to communicate with recesses 39 and 40 This is clearly shown in Figs. 17 and 18. In the second molding operation, plate 3| is placed inra mold 42, illustrated in Fig. 18. Patrix I43 may have a series of passages 44 and 45 communicating4 with recesses 35 and 38, respectively. The patrix 46 may, in this instance,'receive plate 3| by having the proper cavity formed in its face. If preferred, the arrangement may provide letters 30 and vsurfaces In this instance, plate I is providedarticle may be both inlaid and in relief.

32 and 33 flush with the front face of the plate instead of in relief, asshown in the variant embodiments above described. It will be understood that the formation of the letters 30 and surfaces 32 and 33 with respect 'to whether they will be flush, recessed or in relief will depend upon the manner in which the cavities are formed inthe molds.

In this second injection-molding operation, the differently colored material forming letters 30 will not only fill recesses 31 in the front face of plate 3| but also recess 35 formed at the rear face 36. This material will form a mechanical interlocking key 46' in recess 35 that will securely hold letters 30 in their recesses 31 although it will be understood that injection-molding under high pressure may effectively form a bond that will prevent letters 30 from being displaced from their recesses 31 independently of key means 46'. Again recess 35 may vassume any proper shape to perform its function and Apermit adequate access to recesses 31 to assure an efficient and proper flow of the material into said recesses 31.

Injecting the material into recesses 39 and 40 to form surfaces 32 and 33 may be performed during the same injection operation forming letters v3l! or by another operation, if so desired.

Also, thematerial injected into recesses `39 and 40 will form key means 41 in recesses 38 that will provide the proper mechanical interlocking action to keep surfaces 32 and 33 rmly held in recesses 39 and 40. It will be understood; however, that recesses 38 extending lengthwise of surfaces 32 and 33 may be dispensed with and other communication with front recesses 39 and '40 provided. Instead of a single recess 38 for each surface 32 and 33 one or more openings (similar to openings 6) extendmgthrough back wall 38 into recesses 33 and 40 will suitably serve the purpose. This isa matter of construction and choice' Asv shown in the drawings, letters 34 are molded or formed as a part of plate 3|. See Fig. 17. However, letters 34 may be formed during the second molding operation to be given a different coloror appearance instead of surface 33, or surface 33 may be formed in the second molding operation and thereafter letters 34 in a subsequent operation. This is a matter of choice.

Figs. 19 and 20 further illustrate a construc.

tion substantially the same as shown in Figs. 13 to 1'7, inclusive. However, letters 30 project slightly in relief upon the front face of plate 3|. As stated previously, it will be apparent that any desirable arrangement in this connection may be provided without departing from the scope of the invention. The same is true with such surfaces as 32 and 33, shown in Fig. 13. y

A device made in accordance with this invention may be subjected to any number of molding operations. Surfaces like 32 and 33 and characters like any of those herein described, or other types or kinds of symbols that are possible to form, may be made in more than one or two colors. Certain surfaces or characters on a single The combinations are numerous as will be apparent from the foregoing'description and a proper understanding of the invention and the advantages and benefits obtained.

Not only hasa new product lbeen produced, but also' a novel process devised that efficiently and economically produces this new product and overcomes many difllculties heretofore experiname plates or like articles with differently colored combinations of parts that go to make up I these name plates or like articles in a simple and economical manner is pointed out. These plates or articles have a'nished appearance that, with Atheir color variances, make them very attractive and exceedingly useful.

vThe letters, characters, symbols, surfaces, or whatever may be formed by the second operation, have the appearance of being an integrally formed component part of the product. This has value and importance, not only from the construction and sales standpoints, but also from the use thereof and the appeal it presents.

Figs. 21 to 24 illustrate a further possible embodiment of the invention in the form of a dial 50 having markingsor calibrations 5I formed therein that are transparent or translucent and capable of illumination by a light disposed at the rear of the dial. The construction of dial 50 and markings I is ,substantially the same as described in connection with other embodiments disclosed herein. If desired, dial 50 is provided with a recess or recesses 52 in the front face corresponding to the markings 5l. It is then provided with a longitudinal recess 53 in the rear face preferably of a height at least equal to markings 5l and of a length to include all the marking across .the front face. It will be understood, however, that this recess 53 inthe rear face may be made up of any number of recesses or parts thereof as long as its intended purpose will be accomplished. This recess 53 in the rear face is preferably'of a depth to intersect the recesses 52 in the front face so that the arrangement results in the front recesses 52 openingninto the rear recess 53, as shown in Figs. 23 and 24. Dial 50 is `then placed in a mold and these recesses are filled with a transparent or translucent material, the material in the rear recess forming a key to' lock the markings 5I against displacement, it being noted that the shape of the rear recess 53 renders displacement of the transparent material forming the markings 5I in the front recesses 52 impossible. Hence, a dial construction may be conveniently and inexpensively provided that may be of any shape but which yhave transparent markings or calibrations permitting rear illumination.

It is to be understood that the disclosure of th process herein described and claimed and of its variant embodiments is a disclosure of any product or products that may be produced thereby.

Without vfurther elaboration, the foregoing will so fully explain the gist' of our invention that 'others may, by applying current knowledge, readily adopt the same for use under varying conditions ofk service, without eliminating certain features, which may properly be said to constitute the essential items of novelty involved, which items are intended to be defined and secured to us by the following claims.

We claim:

1. A method of molding a plastic product having portions formed of differently colored materials which comprises making a body of material of one color with recesses in one of its sides corresponding to the configuration of one `or more of said portions, injecting under relatively high pressure materialof a different color in said re cesses to form said one or more. portions upon said side by said injection operation, and effecting a bond by said high pressure injection that unites said portions with said body to form in effect a single integrally formed unit that distining opposed front and rear faces so that said in' o diciaI is exposed along the front face which comprises forming indicia-conforming recesses of predetermined depth in said body along said front face, forming a recess in said body along said rear face, making said recess of a depth and,

cross-sectional formation that it will intercept and communicate with said indicia-conforming recesses at a plurality of predetermined points, rendering workable and iluid by heat a mass of plastic material of a different color than the material of said body and injecting the uid material into said indicia recesses and said intercepting recess to form said indicia and to fill said intercepting recess until said material is flush with said rear face, and effecting a permanent bond between said body and the uld material in said recesses when it hardens to form in effect an integrally formed unit distinguishing the material in said recesses from said body substantially by color separation only.

3. A method of molding indicia to be exposedl through said places of communication to form said indicia upon the front face, and effecting a permanent bond between said body and the fluid material in said recesses when it hardens that forms in effect an integrally formed unit.

4. A method of molding indicia upon a body having relatively opposed front and rear faces so that said indicia is exposed along the front face which comprises forming a recess in said body along the rear face, providing a number of communicating passages between said recess and the front face, placing said body in a mold having an indicia-conforming recess therein exposed to the front face of said body and said communicating passages, and injecting indiciaforming material into said recess in the rear face of said body through said communicating passages and into said indicia-conforming recess in said mold to fill both said indicia-conforming recess and said recess in the rear face and form a permanent bond between said body and ther injected material when it hardens.

5. 'I'he method of forming a plastic product such as a name plate having alphabetical formations or other like indicia portions disposed upon vthe front face of the plate in contrasting colors which comprises first providing a plate composed of a plastic material having a finished front face and a rear face, providing a recess in the finished front face of the contour of an alphabetical formation or other indicia portion to be formed and a recess in the rear face in a plane parallel to the plane occupied by the recess in the front face so that the floors of both recesseslare generally parallel to each other, making both said recesses of a depth so that theI floor of the recess in the rear face intercepts the floor of the recess in the front face where the recess in the front face crosses the recess in the rear face to provide a communicating opening therebetween that occupies a portion only of the floor of the recess in the front face but provides a flow communication y accesos .mation or other indicia portion to be formed. v

with the entire recess in the frontface, and forcing a molten mass of plastic material of a contrasting color into the recess in the rear face and through said communicating opening until both the recess in the rear face and the recess in the front face are filled under a pressure that forms a permanent bond between the plate and the molten plastic material and causes the contact.- ing surfaces of the plate and the molten plastic material to so intimately unite when the molten plastic material cools that the separation between the plate and the hardened plastic material will appear to be dened substantially by color separation only.

6. The method of forming a plastic product having alphabetical formations or other like indicia portions disposed upon the front face of the same in contrasting colors which comprises first providing a molded body of a plastic material having front and rear faces, providing a recess in the front face 'of the contour of an alphabetical formation vor other indicia portion to be formed, providing a recess in the rear face of a depth causing its floor to intercept the floor of the recess in the front face to provide a communicating opening or openings that occupy a portion only of the floor of the recess in the front face but provide a flow-communication with the entire recess in the front face,and forcing n molten mass of plastic material of a contrasting cular through the recess in the rear face until botli'tlie recess in the rear face and the recess in the front face are filled under a pressure forming a permanent bond between the molded body and the molten plastic material causing the contacting surfaces of the molded body and the molten plastic material to sol intimately unite when the molten plastic material cools that the separation between the plate and the hardened plastic material will appear to be defined by color separation only.

7. The method of forming a plastic product such as a name plate having alphabetical formations or other like indicia portions disposed upon the front face of the plate in contrasting colors which comprises rst providing a plate composed of a plastic material having a front face and a rear face, providing one or more recesses in the front face of the contour of an alphabetical formation or other indicia portion to be formed, providing a recess in the rear face, making said recess in the rear face of a depth and forming it across the rear face so that it will intercept each recess in the front face to provide a flow communication that occupies a portion only of the floor area of each recess in the front face, fiowing a molten mass of plastic material into said recesses so that by reason of said ow communication therebetween all said recesses in both front and rear faces are filled under a pressure forming a permanent bond between the plate and the molten plastic material causing-the contacting surfaces of the plate and the molten plastic material to so intimately unite when the molten plastic material cools that the separation between the plate and the hardened plastic material will appear to be defined by color separation only.

8. The method of forming a plastic product such as a name plate having alphabetical formations or other like indicia portions disposed upon the front face of the plate in contrasting colors which comprises first providing a plate composed of a plastic material having a front face and a rear faceproviding one or more recesses in the front face of the contour of an alphabetical forl the recess in the rear face and said openings until posed upon the front face of the plate in con` all of each recess in the front face is filled under a pressure that forms a permanent bond between the plate and the molten plastic material and causes the contacting surfaces of the plate and the molten plastic material to so intimately unite when the molten plastic material cools that the separation between the plate and the hardened plastic material will appear to be defined by color separation only.

9. The method of forming a plastic product such as a name plate having alphabetical formations or other indicia portions disposed upon the front face of the plate in contrasting colors which comprises first providing a plate composed of a plastic material having a front and a rear face, providing a recess in the rear face that extends crosswise of the area to be occupied by the alphabetical or other like indicia portion upon the front face but of a depth less than the thickness of the plate, forming communicating openings in the plate between the rear recess and the front face at points to be covered by the alphabetical or other indicia to be formed, rendering workable and fluid by heat a mass of plastic material which is of a color contrasting With the color of the material of the plate, placing the plate in a die provided with a cavity of the shape of the alphabetical or other indicia to be formed with the front face of the plate facing the cavity. forcing the fluid mass of plastic material into the die so that by reason of the communicating open-L ings in the plate both the cavity and the recess in the rear face are filled, the molten mass being forced into the die under a pressure causing the plate and the molten mass when cooled to form a permanent bond wherein the contacting surfaces of the plate and the hardened mass of plastic material are so intimately united that the separation between the same will appear to be defined by color separation only.

10. The method of forming a plastic product such as a name plate or the like having alphabetical formations or other indicia portions distrasting colors which comprises first providing a plate composed of plastic material having a front and a rear face, providing a recess in the rear face that extends crosswise of the area to be occupied bythe alphabetical or other like indicia portion upon the front face but of a depth less than the thickness of the plate, forming communicating openings in the plate between the rear recess and the front face at points to be covered by the alphabetical or other indicia to be formed, rendering workable and fluid by heat a mass of plastic material which is of a' color contrasting with the color of the material of the plate, placing the plate in a dia-forcing the fluid mass of plastic material into the die to form the alphabetical or other indicia upon the front face so that by reason of the communicating openings in the plate the recess in the rear face is filled therewith and the alphabetical or other indicia is formed upon the front face, the fluid plastic material being forced into the die under a pressure causing the plate and the fluid plastic material when cooled to form a permanent bond wherein the contacting surfaces of the plate and the hardened plastic material are so intimately united that the separation between the same will appear to be deiined'by color separation only.

11 The method of forming a plastic product having a number of alphabetical or other like indicia formations arranged in a decorative manner and occupying different portions of the area ofthe front face and in color contrast with the front face which comprises providing a body of plastic material with recesses 1n-the, front face corresponding to the alphabetical or other like indicia portions to be formed, providing said recesses in the front face each with a definitely-,formed floor that lies within the body of said plate a predetermined distance, providing one or more recesses in the rear face ofthe body, arranging each such recess in the rear face in a crosswise relation with respect to certain or all of the recesses in the front face and with openings that communicate with said recesses in the front face, the openings occupyirrg a portion only of the floor of said recesses in the front face but providing a now communication with all of each of said recesses in the front face, injecting a molten mass of plastic material of a color contrasting with the color of the plastic material of the body into the recess or recesses in the rear face to illl all said recesses under a pressure intimately uniting the contacting surfaces of the body and the molten plastic material when it cools so that the body and the alphabetical or indicia formations appear to be made in a single forming operation.

12. The method of making a plastic article of contrasting colors by a double molding operation which includes, as the rst step, the molding 'of a body of plastic material in a single operation with a recess in the front face and a recess in the rear face, said recesses having definitely formed oors that lie a predetermined depth within said body of plastic material with communicating openings therebetween that occupy a limited portion only of the iioor of the recess of the front face, rendering workable and fluid by heat a mass of plastic material which is of a color contrasting with the color of the plastic material of the body, and, as the second step. filling both recesses with the fluid mass of plastic material of contrasting color by a single molding operation which includes injecting the fluid mass into one of the recesses under a pressure forcing the uid mass into the other recess through said communicating openings to cause the contacting surfaces of the body and the fluid mass to intimately unite and form a permanent bond between both plastic materials that is distinguishable substantially by color separation only and to form the injected plastic material when it cools into a hardened mass of a cross section preventing displacement in any direction. J

13. The method of molding indicia in a body having front and rear faces so that the indicia is exposed along the front face which comprises forming a recess in the front face and a recess in the rear face having a combined depth equal substantiallly to the thickness of the body, a recess in the rear face being arranged in the same general direction as the recess in the front face but of a different configuration so that the floors of both recesses intercept at limited points and provide openings therebetween, flowing a molten f mass ofmaterial of different color than the color of the body into one of said recesses and through said openings'to fill the other recess,v and employing a pressure in owing the molten mass to form a permanent bond between the same and the'body when the molten mass cools.

JOSEPH A. GITS. JULES P. GITS. 

